Two successful synthetic routes to trichostatin A (1) are described; one (Scheme 2) uses the γ-alkylation of a silyl dienol ether, the other (Scheme 4) uses a silyl-protected cyanohydrin anion. The two routes bear an upolung relation to each other. The Lewis acid-catalysed acylation of silyl enol ethers is a simple and effective way to prepare β-diketones and β-keto esters (Scheme 1); this reaction
Reactions of ethyl diazoacetate with β-methylfurans
作者:Ernest Wenkert、Haripada Khatuya、Phillip S. Klein
DOI:10.1016/s0040-4039(99)01007-2
日期:1999.7
Reactions of β-methylfuran and 2,4-dimethylfuran with ethyldiazoacetate in the presence of [Rh2(OAc)4] catalyst, followed by iodine-induced isomerization, yielded furan ring-unravelled products. The results are compared with those of α-methylfurans.