A synthetic method for N-protected allylic amines from allyl ethers using c
hlorosulfonyl isocyanate (CSI) is presented. The reaction of 4-phenylbut-2-
enyl methyl ether (1i) with CSI afforded methyl N-(1-benzylallyl)carbamate
(2i) and methyl N-(4-phenylbut-2-enyl)carbamate (N) in a 1:1.1 ratio. On th
e other hand, 1-benzylallyl methyl ether (1k) afforded the same products in
a 4.6:1 ratio. The reactions of 1,4-diphenylbut-2-enyl methyl ether (1p) a
nd (1-benzylcinnamyl) methyl ether (1q) with CSI gave only one product, met
hyl N-(1-benzylcinnamyl)carbamate (2p), due to the steric hindrance of the
phenyl ring and the formation of a stable conjugated product. We also exami
ned the reactions of diene ethers (4) with CSI. (C) 2001 Elsevier Science L
td. All rights reserved.