作者:K. Schulze、K. Wy�uwa、H. Trauer、A.-K. Habermann
DOI:10.1002/prac.19933350607
日期:——
In contrast to the well known alpha-campholenic (B) and fencholenic compounds (C) little is known about beta-campholenic derivatives (A) because of their difficult accessibilitiy. Beta-campholenic compounds (A) can be obtained: (1) by Baeyer-Villiger oxidation of camphor via lactone 7 and beta-dihydrocampholenic lactone (5); (2) by Beckmann fragmentation of camphor oxime via alpha-(2) and beta-campholenic nitril (3) and the lactone 5; and (3) by acid catalysed rearrangement of alpha-campholenic derivatives (B, 17a, b). The beta-analogous brahmanol (14) can be synthesized by the reaction of the beta-campholenic bromide (11) with methyl diethyl malonate or by rearrangement of brahmanol.