Asymmetric Electrophilic α-Amidoalkylation, VII1): Generation, Crystal Structure, and Trapping Reactions of a Chiral 6,7-Dimethoxy-1,2,3,4-tetrahydroisoquinoline Derived N-Acyliminium Ion
作者:Klaus Th. Wanner、Ilona Praschak、Ulrich Nagel
DOI:10.1002/ardp.19903230605
日期:——
The camphanic acid amide 4 has efficiently been oxidized with triphenylcarbenium tetrafluoroborate (3) to yield the chiral N‐acyliminiumion 1. Trapping reactions of 1 with the silyl nucleophiles 7a‐c and 10a‐f proceeded with stereoselectivebond formation, affording the diastereomers (R)‐8/(S)‐9a‐c and (R)‐11/(S)‐12a‐f, respectively, with diastereoselectivities of up to 93.9/6.1.
WANNER, KLAUS TH.;PRASCHAK, ILONA, HETEROCYCLES, 29,(1989) N, C. 29-33
作者:WANNER, KLAUS TH.、PRASCHAK, ILONA
DOI:——
日期:——
WANNER, KLAUS TH.;PRASCHAK, ILONA;NAGEL, ULRICH, ARCH. PHARM., 323,(1990) N, C. 335-350
作者:WANNER, KLAUS TH.、PRASCHAK, ILONA、NAGEL, ULRICH
DOI:——
日期:——
Biomimetic Total Synthesis of <i>Dysoxylum</i> Alkaloids
作者:Carlos E. Puerto Galvis、Vladimir V. Kouznetsov
DOI:10.1021/acs.joc.9b02093
日期:2019.12.6
A five-step totalsynthesis of Dysoxylum alkaloids has been achieved using a biomimetic approach from zanthoxylamide protoalkaloids. The synthesis featured a direct amidation and a Bischler-Napieralski reaction to form the dihydroisoquinoline ring, which was then subjected to a Noyori asymmetric transfer hydrogenation to establish the stereogenic center at C-1. Our synthetic sequence provides an important