Synthesis of (±)-aklavinone and (±)-auramycinone via electron-deficient o-quinonoid pyrones
作者:David W. Jones、Christopher J. Lock
DOI:10.1039/p19950002747
日期:——
Dehydration of the formyl acid 3 (R = H) with acetic anhydride in benzene at 80 degrees C generates the quinonoid pyrone 4 which can be trapped with norbornadiene, N-phenylmaleimide and enol silyl ethers; the adduct 6 (R = Me, P = TES) and its 9-epimer 10 from 2-(triethylsilyloxy)propene are readily transformed into (+/-)-auramycinone 2 (R = Me) whilst those [6 (R =vinyl, P = TES) and its 9-epimer] from 2(triethylsilyloxy)buta- 1,3-diene are readily converted into the methyl ethers 24, 25, 33 and 34 of which 24, 33 and 34 are known to be readily converted into (+/-)-aklavinone 2 (R = Et).