5-endo-trig Radical Cyclization of 2-Chloro- and 2,2-Bis(phenylthio)-N-methyl- N-(6-phenylcyclohex-1-en-1-yl)-acetamides
作者:Masazumi Ikeda、Shinji Ohtani、Michiyo Okada、Emi Minakuchi、Tatsunori Sato、Hiroyuki Ishibashi
DOI:10.3987/com-96-7629
日期:——
Treatment of 2-chloro-N-methyl-N-(6-phenylcyclohex-1-en-1-yl)-acetamide (4a) with Bu3SnH in the presence of AIBN gave a 2.5:1 mixture of cis- and trans-fused N-methyl-7-phenyloctahydroindol-2-ones (5a and 5b) (13% combined yield), N-methyl-N-(2-phenylcyclohex-1-en-1-yl)acetamide (6) (19%), N-methyl-N-(6-phenylcyclohex-1-en-1-yl)acetamide (7) (13%), and N-(cyclohex-1-en-1-yl) -N-methyl-2-phenylacetamide (8) (4%). Similar treatment of the 2,2-bis(phenylthio)acetamide (4b) gave a 1:1 mixture of 5a and 5b (61% combined yield) along with 6 (24%) and 7 (trace). Possible mechanisms for the formation of the products (6)-(8) are also discussed.