Helvetica Chimica Acta p. 439 - 454 (1990)
Update date:2022-07-29
Topics:
Freund, Ralf
Mahboobi, Siavosh
Noack, Klaus
Schoenholzer, Peter
Bernauer, Karl
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 (B) as homochiral auxiliary.The structures of the tricycles 4, (2'R,3S)-19B, and (2'S,3R)-20C were established by X-ray analysis, the structures of the others by NOE and CD studies, and by chemical correlation.Possibilities to explain the steric course of the spirocyclizations are discussed.
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