Products of the Direct Reaction of the Diazonium Ion of a Metabolite of the Carcinogen <i>N</i>-Nitrosomorpholine with Purines of Nucleosides and DNA
作者:Charles N. Zink、Nicolas Soissons、James C. Fishbein
DOI:10.1021/tx100093a
日期:2010.7.19
major products in the cases of both the nucleoside and DNA adducts. The rates of formation of HE adducts are accelerated in DNA, relative to the nucleosides in the cases of the N7-EA-Ade, N7-EA-Gua, and O6-EA-Gua adducts by factors of 7, 14, and 54, respectively. The initial rates of depurination of the N3-EA-Ade, N7-EA-Gua, and N7-EA-Gua adducts have also been quantified, and they are unexceptional in
Organocatalytic Asymmetric Mannich Cyclization of Hydroxylactams with Acetals: Total Syntheses of (−)-Epilupinine, (−)-Tashiromine, and (−)-Trachelanthamidine
作者:Dipankar Koley、Yarkali Krishna、Kyatham Srinivas、Afsar Ali Khan、Ruchir Kant
DOI:10.1002/anie.201407185
日期:2014.11.24
cyclization between a hydroxylactam and acetal is described to provide fused, bicyclic alkaloids bearing a bridgehead N atom. Both aliphatic and aromatic substrates were used in this transformation to furnish chiral pyrrolizidinone, indolizidinone, and quinolizidinone derivatives in up to 89 % yield and 97 % ee. The total syntheses of (−)‐epilupinine, (−)‐tashiromine, and (−)‐trachelanthamidine also