2-Phenylisoindolin-1-one (cas: 5388-42-1) belongs to indole derivatives. Indole is an important structural motif of various drugs, therapeutic leads besides its prevalence in numerous natural products, agrochemicals, perfumery, and dyes. More than 200 indole derivatives have already been marketed as drugs or are under advanced stages of clinical trials.Reference of 5388-42-1
Intramolecular reactions of amides. II. Cyclization of amides of 闂?bromocarboxylic acids was written by Stirling, C. J. M.. And the article was included in Journal of the Chemical Society in 1960.Reference of 5388-42-1 This article mentions the following:
C6H11NH2 (45 g.) in 100 ml. Et2O added to 缂?bromobutyryl chloride (from 38 g. acid) in 300 ml. Et2O gave 38 g. 缂?bromo-N-cyclohexylbutyramide (I), m. 60闂? I heated at 100闂?gave 2-cyclohexyliminotetrahydrofuran H Br salt (II), m. 132闂? from which the base (III), b. 134闂?7 mm., nD20 1.4945 (methiodide m. 187-8闂?, was obtained. III (2 g.) in 20 ml. 20% aqueous H2SO4 16 hrs. at 100闂?gave 0.5 g. 缂?butyrolactone (IV), b. 97闂?18 mm., nD22 1.4350, and 1.0 g. C6H11NH2. III (10 g.) with 2 g. LiAlH4 gave 4.6 g. 4-cyclohexylaminobutanol, b. 153闂?9 mm., n21D 1.4830, m. 45.6闂? III with PhMgBr gave a product of unknown structure. I (3.5 g.) refluxed 24 hrs. in 10 ml. EtOH and 500 ml. Et2O added yielded 0.77 g. C6H11NH3Br. Evaporation of the filtrate gave 0.34 g. IV after distillation and 2.1 g. N-cyclohexyl-缂備礁澧介幆鍧県oxybutyramide (V), m. 68.5闂? I (5 g.) with 15 g. powd. KOH 3 min. at 100闂?gave 1.2 g. 1-cyclohexyl-2-pyrrolidone, b. 154闂?7 mm., nD14 1.5005. II (3 g.) refluxed 24 hrs. in 10 ml. EtOH gave 0.4 g. IV and 1.85 g. V. 缂?Ethoxybutyryl chloride (from 1.7 g. acid) with C6H11NH2 gave 1.5 g. V. 缂?Bromobutyranilide (VI) resisted cyclization. Ethanolysis of 3 g. VI gave 100% IV. VI (7 g.) and 3.1 g. Et3N refluxed 1 hr. in 25 ml. EtOH gave 3.3 g. 1-phenyl-2-pyrrolidone, b. 188/14 mm., m. 66-8闂? 缂?Bromo-N-butylbutyramide (25 g.) kept. 1.5 hrs. at 125闂?gave 2.4 g. 2-butyliminotetrahydrofuran (VII), b. 92闂?9 mm., nD18 1.4593. Hydrolysis of 0.9 g. VII in 20% H2SO4 24 hrs. at 100闂?gave 0.2 g. IV and BuNH2 (55 g. p-nitrobenzoyl derivative, m. 100-1闂?. VII (2.9 g.) with 1 g. LiAlH4 gave 1.1 g. 4-butylaminobutanol, b. 132闂?10 mm., nD21 1.4508. N-Benzyl-缂?bromobutyramide, m. 58闂? could not be cyclized. 5-Bromo-N-cyclohexylvaleramide (VIII) (12 g.) heated 1 hr. at 100闂?and Et2O added yielded 7 g. 2-cyclohexyliminotetrahydropyran HBr salt (IX), m. 108-9闂? IX (4.6 g.) in 20 ml. H2O was added to 100 ml. saturated brine, 200 ml. Et2O and 20 ml. 10% aqueous KOH added, then the base quickly extracted and distilled to give 1.9 g. 2-cyclohexyliminotetrahydropyran (X), b. 134闂?8 mm., nD21 1.4980. X (1.6 g.) with 0.5 g. LiAlH4 gave 0.89 g. 5-cyclohexylaminopentanol, m. 74-5闂? Ethanolysis of 2 g. VIII gave 0.7 g. C6H11NH3Br and 0.3 g. 闂?valerolactone (XI), b. 12 mm. IX (0.6 g.) with 10 ml. 20% H2SO4 16 hrs. at 100闂?gave 0.05 g. XI and 98% C6H11NH2. 5-Bromovaleranilide (3 g., m. 96-7闂? refluxed 3 hrs. in 10 ml. EtOH gave 1.27 g. PhNH3Br and 0.5 g. XI. o-Bromomethylbenzoyl bromide (XIII) (23 g.) with 17 g. PhNH2 in 300 ml. Et2O gave 15 g. 2-bromomethylbenzanilide (XIII), m. 83闂? XIII fused at 130闂?gave 1,3-dihydro-1-phenyliminoisobenzofuran HBr salt (XIV), m. 164-5闂? XIV (14 g.) in H2O basified with aqueous Na2CO3 gave 10 g. 1,3-dihydro-1-phenyliminoisofuran (XV), m. 99.5闂? XV (0.75 g.) in 20% H2SO4 1.5 hrs. at 100闂?gave 0.40 g. phthalide (XVI) and 92% PhNH2. XV (1 g.) 2 hrs. at 300闂?gave 0.7 g. N-phenylisoindolinone, m. 166-7闂? XV (3.5 g.) with 1 g. LiAlH4 gave 2.7 g. 2-hydroxymethyl-N-phenylbenzylamine, b. 156闂?0.03 mm., m. 59-60闂? XII (21 g.) with 18 g. PhCH2NH2 in 250 ml. Et2O gave 7 g. 1-benzylimino-1,3-dihydroisobenzofuran (XVII), m. 37-8闂? nD25 1.6103 (methiodide, m. 143-4闂?. Hydrolysis of XVII with 20% H2SO4 gave 88% XVI and 97% PhCH2NH2. XVII.HBr (5 g.) refluxed 5 hrs. in 10 ml. EtOH gave 1.62 g. PhCH2NH3Br, m. 225闂? 1.13 g. XVI, and 0.5 g. N-benzyl-2-ethoxymethylbenzamide, m. 86.5闂? XVI (3 g.) and PhCH2NH2 heated 3 hrs. at 260闂?gave 3.2 g. 2-benzylisoindolinone, m. 90闂? Similarly, XVI and C6H11NH2 gave 2-cyclohexylisoindolinone, m. 112-13闂? XII (10.5 g.) with 7.2 g. C6H11NH2 in 150 ml. Et2O gave 4 g. 1-cyclohexylimino-1,3-dihydrobenzofuran (XVIII), m. 79-80闂?(methiodide m. 202闂?. Hydrolysis of XVIII gave 92% XVI and 87% C6H11NH2. In the experiment, the researchers used many compounds, for example, 2-Phenylisoindolin-1-one (cas: 5388-42-1Reference of 5388-42-1).
2-Phenylisoindolin-1-one (cas: 5388-42-1) belongs to indole derivatives. Indole is an important structural motif of various drugs, therapeutic leads besides its prevalence in numerous natural products, agrochemicals, perfumery, and dyes. More than 200 indole derivatives have already been marketed as drugs or are under advanced stages of clinical trials.Reference of 5388-42-1
Referemce:
Indole alkaloid derivatives as building blocks of natural products from闂佽壈浜崹淇沜illus thuringiensis闂佽壈浜粋鍧闂佽壈浜崹淇沜illus velezensis闂佽壈浜粋鍧 their antibacterial and antifungal activity study,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles