The total synthesis of D,L-hapalindoles J and U has been accomplished. Hapalindole J was prepared in 11% overall yield over 11 synthetic steps and hapalindole U was prepared in 25% overall yield over 13 synthetic steps from commercially available materials. The route employs a novel silyl ether-based strategy for accessing the 6:5:6:6 ring system of the hapafindoles rapidly and in good yields.
Synthetic studies of marine alkaloids hapalindoles. Part I Total synthesis of (±)-hapalindoles J and M
作者:Hideaki Muratake、Mitsutaka Natsume
DOI:10.1016/s0040-4020(01)96005-3
日期:——
The first concise synthesis of marine indole alkaloids (±)-hapalindoles J (4) and M (5) was achieved in seven or six steps starting from a readily available compound 6 using important key reactions, 6 → 7 → and 8 and 35 → 41 or 5.
A practical method for regiocontrolled one-carbon ring contraction
作者:Matthew J. Mitcheltree、Zef A. Konst、Seth B. Herzon
DOI:10.1016/j.tet.2013.04.027
日期:2013.7
A practical and efficient method for the perfluorobutanesulfonyl azide-mediated one-carbon ringcontraction of cyclic enoxysilanes is described. High-yielding procedures for the elaboration of the resulting N-acyl sulfonamide products are reported.