Reversal of Selectivity in C3-Allylation and Formal [3 + 2]-Cycloaddition of Spiro-epoxyoxindole: Unified Synthesis of Spiro-furanooxindole, (±)-<i>N</i>-Methylcoerulescine, (±)-Physovenine, and 3a-Allylhexahydropyrrolo[2,3-<i>b</i>]indole
作者:Saumen Hajra、Sayan Roy、Subrata Maity
DOI:10.1021/acs.orglett.7b00420
日期:2017.4.21
a formal [3 + 2]-annulation reaction of spiro-epoxyoxindoles have been developed and can be accessed simply by changing the reaction conditions. This method has been successfully employed for the synthesis of spiro(pyrrolidinyloxindole), 3a-allylhexahydropyrrolo[2,3-b]indole, and furanoindoline.
已经开发出有效的路易斯酸催化的区域选择性C 3-烯丙基化和螺-环氧氧吲哚的正式[3 + 2]-环化反应,并且可以通过改变反应条件来简单地获得。该方法已成功地用于合成螺(吡咯烷基二氧杂吲哚),3a-烯丙基六氢吡咯并[2,3- b ]吲哚和呋喃二氢吲哚。
A General Protocol toward Oxindoles Bearing C3‐Allylic Quaternary Stereocenter via Domino Reaction: A Concise Synthesis of Heterocycle‐Fused Indoline Alkaloids
efficiently catalytic method toward the synthesis of indolin-2-ones featuring an allylic derived C3-quaternary stereocenter via an intramolecular Heck cyclization/Suzuki coupling of N-substituted-N-(2-bromophenyl)acrylamides and organoboron reagents was successfully developed by using a 1,3-bis(2,6-diisopropylphenyl)acenaphthoimidazol-2-ylidene (AnIPr)-ligated oxazoline palladacycle. It enabled a very broad