The Lewis acid mediated cyclization of gamma-oxygen substituted allylic stannanes 1, 2 and 9, bearing a hydrazone group at the terminus of the carbon chain, afforded the corresponding trans-beta-amino cyclic ethers 3a, 4a and 10, respectively, with very high diastereoselectivities in high chemical yields.
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[11]
YAMAMOTO Y, 1994, B SOC CHIM BELG, V103, P619