The 1,4-elimination reaction of (Z)-N-Boc-2-(4-methoxy-2-alkenyloxy)pyrrolidines (1) is shown to proceed with high (1E,3E)-stereoselectivity to afford N-Boc-2-(1,3-dienyloxy)pyrrolidines (2); the Brønsted acid catalyzed aza-Ferrier reaction of the N-Boc-2-(1,3-dienyloxy)pyrrolidines (2) provides α-(N-Boc-2-pyrrolidinyl) aldehydes (3) in excellent yields with high α-regioselectivities.
(Z)-N-Boc-2-(4-甲氧基-2-烯丙氧基)
吡咯烷(1)的1,4-消除反应表现出高度的(1E,3E)-立体选择性,生成N-Boc-2-(1,3-二烯氧基)
吡咯烷(2);布朗斯特酸催化的N-Boc-2-(1,3-二烯氧基)
吡咯烷(2)的氮杂-费里尔反应在优异的产率下提供了具有高α-区域选择性的α-(N-Boc-2-
吡咯烷基)醛(3)。