Hh. Wasserman et al., Pyrrole-singlet oxygen reactions leading to alpha,alpha '-bipyrroles. Synthesis of prodigiosin and analogs, TETRAHEDR L, 40(43), 1999, pp. 7587-7589
Reaction of the tert-butyl ester of 3-methoxy-2-pyrrolecarboxylic acid with
singlet oxygen yields a hydroperoxide intermediate which undergoes couplin
g with pyrroles to yield precursors of prodigiosin and ring A analogs, read
ily convertible to the corresponding tripyrromethenes. (C) 1999 Elsevier Sc
ience Ltd. All rights reserved.