烯酮S,S-硫缩醛(1)和烯酮OS-硫缩醛(6)的新的合成方法,涉及羰基化合物与甲酰基膦酸酯的金属化S,S-和O,S-硫缩醛的Horner-Wittig反应(4和5)被描述。4与芳族醛的霍纳-维蒂希反应可以在两相条件下进行。通过低温31 P NMR光谱研究了4和5中碳负离子的生成以及它们与羰基化合物的反应过程。已发现,甲酰基膦酸酯的S,S-硫缩醛(4)与甲膦酸酯的O,S-硫缩醛(5)相比非常容易金属化。)仅在用叔丁基锂处理时才能形成锂衍生物。从31 P NMR光谱中未获得证据支持形成甲酰基膦酸酯的0-0-缩醛的锂衍生物(12)。
A total synthesis of a key lactone intermediate in the synthesis of (+)-thienamycin is described, based on a strategy that uses "chiral templates" derived from D-glucose.
Substrate-Controlled and Organocatalytic Asymmetric Synthesis of Carbocyclic Amino Acid Dipeptide Mimetics
作者:Stephen Hanessian、Dilip K. Maji、Subramaniyan Govindan、Riccardo Matera、Marina Tintelnot-Blomley
DOI:10.1021/jo100017t
日期:2010.5.7
The asymmetric synthesis of a carbocyclic delta-amino acid representing the P-2/P-3 subunit of a nonpeptidic truncated peptidomimetic molecule is described relying on two independent approaches.
Mlotkowska,B. et al., Journal fur praktische Chemie (Leipzig 1954), 1977, vol. 319, p. 17 - 22
A new and generalsynthesis of ketene S,S-thioacetals (1) and ketene O.S-thioacetals (6) which involves the Horner-Wittig reaction of carbonyl compounds with the metallated S,S- and O,S-thioacetals of formyl-phosphonates (4 and 5) is described. The Horner-Wittig reaction of 4 with aromatic aldehydes can be carried out under two-phase conditions. The generation of the carbanions from 4 and 5 as well
烯酮S,S-硫缩醛(1)和烯酮OS-硫缩醛(6)的新的合成方法,涉及羰基化合物与甲酰基膦酸酯的金属化S,S-和O,S-硫缩醛的Horner-Wittig反应(4和5)被描述。4与芳族醛的霍纳-维蒂希反应可以在两相条件下进行。通过低温31 P NMR光谱研究了4和5中碳负离子的生成以及它们与羰基化合物的反应过程。已发现,甲酰基膦酸酯的S,S-硫缩醛(4)与甲膦酸酯的O,S-硫缩醛(5)相比非常容易金属化。)仅在用叔丁基锂处理时才能形成锂衍生物。从31 P NMR光谱中未获得证据支持形成甲酰基膦酸酯的0-0-缩醛的锂衍生物(12)。