Unprecedented stereochemical control in the intramolecular ene-reactions of δ,ε-unsaturated aldehydes using exceptionally bulky organoaluminum reagents: Elucidation of the transition state
作者:Takashi Ooi、Keiji Maruoka、Hisashi Yamamoto
DOI:10.1016/s0040-4020(01)89682-4
日期:——
Unprecedented stereochemical control has been achieved in the type II intramolecular ene reactions of δ,ε-unsaturated aldehydes leading to trans-cyclohexanols with excellent selectivity under very mild conditions, using exceptionally bulky methylaluminum bis(4-bromo-2,6-di-tert-butylphenoxide) (MABR). Success of the stereocontrolled cyclization can be ascribable to the ability of this modified organoaluminum
前所未有的立体化学控制已在类型已经实现δ,ε不饱和醛导致的II分子内烯反应反式使用极其巨大,甲基铝双非常温和的条件下具有优良的选择性-cyclohexanols,(4-溴-2,6-二-叔-丁基苯氧化物)(MABR)。立体控制环化的成功可以归因于这种改性的有机铝试剂MABR改变过渡态构象的能力。检查基板的烯反应7,11,14与MABR,本有机铝助分子内烯反应的立体化学结果被进一步阐明。