Diastereoselective Spirocyclization of<i>C</i>-(Alkyloxycarbonyl)formimines of 2-Substituted 1<i>H</i>Indole-3-ethanamines (= Tryptamines): Basic Studies. 5th Communication on Indoles, Indolenines, and Indolines
作者:Ralf Freund、Siavosh Mahboobi、Klaus Noack、Peter Schonhölzer、Karl Bernauer
DOI:10.1002/hlca.19900730224
日期:1990.3.14
C-(Alkoxycarbonyl)formimines of type 15–18 were derived from the 2-substituted tryptamines 2, 9, 10, and 11 and transformed with tosyl chloride into tricyclic 3-spiroindoles of types 19–22 (Scheme 3). The influence of the homochiral alkoxy moieties A–D on the stereochemical outcome of this reaction was studied. Good-to-excellent diastereoselectivities were observed with the (−)-8-(phenylmenth-3-yl)oxy group
Ç -型的(烷氧基羰基)formimines 15-18是从2-取代的色胺衍生的2,9,10,和11和用甲苯磺酰氯转化为类型三环3- spiroindoles 19-22(方案3)。研究了同手性烷氧基部分AD对该反应的立体化学结果的影响。以(-)-8-(苯基薄荷基-3-基)氧基(B)为纯手性助剂,观察到优异的非对映选择性。三轮车4,(2'R,3 S)-19B和(2'通过X射线分析确定S,3 R)20C,通过NOE和CD研究以及通过化学相关性确定其他化合物的结构。讨论了解释螺环化的空间过程的可能性。