New pyrano[3,4-b]indoles from 2-hydroxymethylindole and l-dehydroascorbic acid
摘要:
2-Hydroxymethylindole reacts with L-dehydroascorbic acid under mild conditions to give (3R,3aR,10cS)-3-[(1S)-1,2-dihydroxyethyl]-3a,10c-dihydroxy-3a,5,6,10c-tetrahydrofuro[3',41:5,6]pyrano[3,4-blindol-1(3H)-one. Its tosyl derivative undergoes cyclization to form a pentacyclic ketal derivative. (c) 2005 Elsevier Ltd. All rights reserved.