T. Faitg et al., General access to polyhydroxylated nortropane derivatives through hetero Diels-Alder cycloadditions. Part 3. Synthesis of natural (+)-calystegine B-2, TETRAHEDR-A, 10(11), 1999, pp. 2165-2174
Cycloaddition of chiral nitroso derivatives with cyclohepta-1,3-diene gave
one single stereoisomer with an excellent selectivity. The structures inclu
ding absolute configurations have been assigned by spectroscopy and X-ray c
rystallography. These studies have been applied to the total synthesis of t
he naturally occurring calystegine B-2. (C) 1999 Elsevier Science Ltd. All
rights reserved.