六氢环戊五[ b ]吡咯衍生物(双环脯氨酸)的非对映选择性一锅合成是通过(E)-叔丁基6-溴-2-己酸(E)-叔丁基酯与α-亚氨基酯的碱介导反应而实现的。使用Cu I /(R)-DTBM-Segphos络合物作为催化剂,按照两步1,3-偶极环加成/分子内烷基化顺序,已经有效地实现了该方法的催化不对称形式。
Asymmetric synthesis of piperidines and octahydroindolizines using a one-pot ring-closure/N-debenzylation procedure
摘要:
The conjugate addition of an enantiopure lithium amide to a zeta-hydroxy-alpha,beta-unsaturated ester followed by a one-pot ring-closure/N-debenzylation protocol has been used in the asymmetric syntheses of (S)coniine and (R)-delta-coniceine (isolated as the corresponding hydrochloride salts), and (R,R)-1-(hydroxymethyl)octahydroindolizine (the bicyclic fragment of stellettamides A-C). (C) 2011 Elsevier Ltd. All rights reserved.
C(sp2)-C(sp3) cross-coupling reactions has been studied via the synthesis of novel radical-clock α-halo-esters and quantum mechanical calculations. These results provide insights into the role of the substrate (halogen and substituents) in competing in-cage and out-of-cage arylation pathways and provide a basis for the future rational design of novel tandem cyclization-arylation reactions using bisphosphine-iron
Asymmetric Synthesis of Piperidines and Octahydroindolizines
作者:Stephen Davies、Deri Hughes、Paul Price、Paul Roberts、Angela Russell、Andrew Smith、James Thomson、Oliver Williams
DOI:10.1055/s-0029-1219346
日期:2010.3
The conjugate addition of a homochiral lithium amide to a xi-hydroxy-alpha,beta-unsaturated ester, followed by a one-pot, ring-closure-N-debenzylation protocol has been used in the asymmetric syntheses of (S)-coniine and (R)-delta-coniceine (isolated as the corresponding hydrochloride salts) and the bicyclic core of stellettamide A.