Retention of Stereochemistry in Gold-Catalyzed Formal [4+3] Cycloaddition of Epoxides with Arenynamides
作者:Somnath Narayan Karad、Sabyasachi Bhunia、Rai-Shung Liu
DOI:10.1002/anie.201203723
日期:2012.8.27
Golden opportunity: [4+3] Cycloaddition reactions of arenynamides and epoxides are enabled under gold catalysis and have a broad substrate scope (see scheme; Ms=methanesulfonyl). An SN2‐type front‐side attack of phenyl at the oxiranyl ring is expected to cause the retention of stereochemistry.
千载难逢的机会:[4 + 3]苯甲酰胺和环氧化物的环加成反应在金催化下得以实现,并具有广泛的底物范围(参见方案; Ms =甲磺酰基)。氧杂环戊基环上的一个S N 2型正面进攻性苯环会导致立体化学的保留。