An efficient one-pot synthesis of (+)-deoxypyridinoline (Dpd, 1), the cross
-link of bone collagen, was achieved from tert-butyl-(S)-(-)-[(2-tert-butox
ycarbonyl)amino]-6-aminohexanoate (2) and tert-butyl-(S)-(-)-6-bromo-2-[bis
(tert-butoxycarbonyl)amino]-5-oxohexanoate (3) in 42% yield. (C) 1999 Elsev
ier Science Ltd. All rights reserved.