Synthesis of Hexacyclic Parnafungin A and C Models
作者:Quan Zhou、Barry B. Snider
DOI:10.1021/jo101826p
日期:2010.12.3
A convergent, practical route to unstable hexacyclic parnafungin A and C models has been developed. Two iodoxanthones were prepared in four or five steps (33-50% overall yield). Suzuki-Miyaura coupling of the iodoxanthones with excess readily available 3-carbomethoxy-2-nitrophenyl pinacol boronate afforded the hindered highly functionalized 2-arylxanthones (53-58%) in the first key step. In the second key step, zinc reduction gave benzisoxazolinones that were treated with MsCl and then base to generate the unstable hexacyclic parnafungin A (13% overall yield for 8 steps) and C (8% overall yield for 9 steps) models. Analogously to the parnafungins, hexacyclic parnafungin C model decomposes to a phenanthridine with a half-life of 2 d in CDCI3.
PATEL, G. N.;TRIVEDI, K. N., INDIAN J. CHEM. B., 27,(1988) N 4, C. 376-377
作者:PATEL, G. N.、TRIVEDI, K. N.
DOI:——
日期:——
Patel, G. N.; Trivedi, K. N., Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1988, vol. 27, # 1-12, p. 376 - 377