Reaction of singlet oxygen with enamino carbonyl systems. A general method for the synthesis of .alpha.-keto derivatives of lactones, esters, amides, lactams, and ketones
addition of (R)-N-tert-butanesulfinyl imidates 8 to α,β-unsaturated pyrazolidinone 3a has been developed to afford pyrazolidinones 10 possessing three contiguous stereocenters with good to excellent yield and excellent diastereoselectivity. A two-step conversion of reduction and cyclization provides the bicyclic pyrazolopiperidine 12 in a good yield. A series of pyrazolopiperidine derivatives 18 with a
Decombe, Annales de Chimie (Cachan, France), 1932, vol. <10> 18, p. 133
作者:Decombe
DOI:——
日期:——
Gupton, John T.; Lizzi, Michael J.; Polk, Dale, Synthetic Communications, 1982, vol. 12, # 12, p. 939 - 946
作者:Gupton, John T.、Lizzi, Michael J.、Polk, Dale
DOI:——
日期:——
Reaction of singlet oxygen with enamino carbonyl systems. A general method for the synthesis of .alpha.-keto derivatives of lactones, esters, amides, lactams, and ketones