Synthesis of (-+)-Lasubine I and (&)-Subcosine I ... Hideo lida, Masao Tanaka, and Chihiro Kibayashi" Tokyo College of Pharmacy, Horinouchi, Hachioji, Tokyo 192-03, Japan ... (&)-Lasubine I and (*)-subcosine I were synthesised by a route involving as a key step a 1,3-dipolar cycloadd it ion. ... The leaves of Lagerstroemia subcostata have been found to contain four new alkaloids, lasubine I(1) and I1 (2), and sub- cosine I (3) and I1 (4).l These alkaloids are ...