One-Pot Synthesis of Highly Functionalized Pyridines via a Rhodium Carbenoid Induced Ring Expansion of Isoxazoles
作者:James R. Manning、Huw M. L. Davies
DOI:10.1021/ja803139k
日期:2008.7.1
A concise one-pot synthesis of highlyfunctionalized pyridines has been developed. The first step in the reaction sequence is the formal insertion of rhodium vinylcarbenoids across the N-O bond of isoxazoles. Upon heating, the insertion products undergo a rearrangement to give 1,4-dihydropyridines. DDQ oxidation then affords the corresponding pyridines in 31-84% yield. The process has proven general
已开发出高度官能化吡啶的简洁一锅法合成。反应序列中的第一步是将乙烯基卡宾铑正式插入到异恶唑的 NO 键上。加热后,插入产物发生重排,得到 1,4-二氢吡啶。然后DDQ氧化以31-84%的产率提供相应的吡啶。该过程已被证明适用于一系列类卡宾和异恶唑组分,并代表了合成功能化吡啶的独特断开策略。
Palladium-catalyzed insertion of α-diazocarbonyl compounds for the synthesis of cyclic amino esters
Two different cyclic amino esters are synthesized by palladium-catalyzed cross-coupling reaction of diazoesters with N-substituted-2-iodoanilines. Aryldiazoacetates lead to cyclic α-amino esters with an α-quaternary carbon centre in the presence of CO. Additionally, arylvinyldiazoacetates afford cyclic α,β-unsaturated γ-amino esters.