Oxidation of 1-benzyl-3,4-dihydroisoquinolines with cerium(IV) ammonium nitrate (CAN) under mild condition yielded the mixture of corresponding 1-benzylisoquinolines (b-type) and 1-benzoylisoquinolines (a- or c-type) in an equal yields. The selective oxidation products (c-type) can be prepared by using MeCN instead of MeOH. In the antiplatelet assays, four inducers were employed, including AA, Col
A simple and practical approach to the synthesis of the marine sponge pigment fascaplysin and related compounds
作者:Oleg S. Radchenko、Vyacheslav L. Novikov、George B. Elyakov
DOI:10.1016/s0040-4039(97)01167-2
日期:1997.7
Fascaplysin , an antimicrobial and cytotoxic red pigment of the marine sponge Fascaplys-inopsis sp., has been synthesized in five steps from tryptamine in 44% overall yield. The key steps in the synthesis are: (a) dehydrogenation of the dihydro-β-carboline intermediate simultaneously with its benzylic oxidation on treatment with MnO2 and (b) the thermal cyclization of the resulting β-carboline into