Structures of the Reactive Intermediates in Organocatalysis with Diarylprolinol Ethers
作者:Uroš Grošelj、Dieter Seebach、D. Michael Badine、W. Bernd Schweizer、Albert K. Beck、Ingo Krossing、Petra Klose、Yujiro Hayashi、Tadafumi Uchimaru
DOI:10.1002/hlca.200900179
日期:2009.7
Structures of the reactive intermediates (enamines and iminium ions) of organocatalysis with diarylprolinol derivatives have been determined. To this end, diarylprolinol methyl and silyl ethers, 1, and aldehydes, PhCH2CHO, tBuCH2CHO, PhCH=CHCHO, are condensed to the corresponding enamines, A and 3 (Scheme 2), and cinnamoylidene iminium salts, B and 4 (Scheme 3). These are isolated and fully characterized
已经确定了用二芳基脯氨醇衍生物进行有机催化的反应性中间体(烯胺和亚胺离子)的结构。为此,diarylprolinol甲基和甲硅烷基醚,1,和醛中,Ph CH 2 CHO,吨卜 CH 2 CHO中,Ph CH = CH CHO,被冷凝成相应的烯胺,甲和3(方案2),肉桂亚胺亚胺盐B和4(方案3)。它们是分离的,并具有熔点/分解点的特征,[α ] D,元素分析,IR和NMR光谱以及高分辨率质谱(HR-MS)。制备了具有BF 4,PF 6,SbF 6和弱配位的Al [OC(CF 3)3 ] 4阴离子的盐。已获得且在本文中描述的烯胺和六级亚铵盐的X射线晶体结构(图2和4-8,以及表2和7),并在先前的初步通信(阖闾化学学报 2008年,91(1999年)。根据NMR光谱(在CDCl中3,(D 6)DMSO,(D 6)丙酮或CD 3 OD;表1),亚胺盐的主要异构体4具有环外N