Synthesis of new nucleoside analogues comprising a methylenecyclobutane unit
摘要:
Synthesis of eight nucleoside analogues 3-10 with a methylene cyclobutane unit is described. Wittig or Peterson reactions with protected 2-hydroxycyclobutanones 12 and 13 gave E- and Z-derivatives, respectively. After functional modifications the heterocyclic moieties were introduced via a Mitsunobu reaction either on the lateral chain or on the cycle. When adenine was used in this reaction only the N-9 substitution products were obtained. Removal of the protecting groups provided the target products. (c) 2005 Elsevier Ltd. All rights reserved.
The first total synthesis of (+)-laurencin (1), which is the most representative marine natural product isolated from red algae, is described via intermediates 2–18. Key steps in the synthesis include a facile oxidative preparation of 2, an effective conversion of 9a to 11, and a SmI2-catalyzed elongation reaction of 15, providing 16a.
Synthesis of new nucleoside analogues comprising a methylenecyclobutane unit
作者:Sophie Danappe、Ashutosh Pal、Christian Alexandre、Anne-Marie Aubertin、Nathalie Bourgougnon、François Huet
DOI:10.1016/j.tet.2005.04.023
日期:2005.6
Synthesis of eight nucleoside analogues 3-10 with a methylene cyclobutane unit is described. Wittig or Peterson reactions with protected 2-hydroxycyclobutanones 12 and 13 gave E- and Z-derivatives, respectively. After functional modifications the heterocyclic moieties were introduced via a Mitsunobu reaction either on the lateral chain or on the cycle. When adenine was used in this reaction only the N-9 substitution products were obtained. Removal of the protecting groups provided the target products. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis of 1,4-ketoaldehydes and 1,4-diketones by Mo-catalyzed oxidative cleavage of cyclobutane-1,2-diols
作者:Sara Gómez-Gil、Rubén Rubio-Presa、Raquel Hernández-Ruiz、Samuel Suárez-Pantiga、María R. Pedrosa、Roberto Sanz
DOI:10.1039/d3ob00436h
日期:——
A new two-step procedure for the synthesis of 1,4-dicarbonyls has been developed involving an efficient and clean Mo-catalyzed oxidativecleavage of cyclobutane-1,2-diols with DMSO, which is used as solvent and oxidant. The required starting glycols were prepared by nucleophilic additions of organolithiums and Grignard reagents to easily available 2-hydroxycyclobutanones.
已经开发了一种用于合成 1,4-二羰基化合物的新两步法,涉及使用用作溶剂和氧化剂的 DMSO 对环丁烷-1,2-二醇进行有效且清洁的 Mo 催化氧化裂解。所需的起始乙二醇是通过有机锂和格氏试剂对容易获得的 2-羟基环丁酮进行亲核加成而制备的。