Approaches to the assembly of the antifungal agent FR-900848: studies on double asymmetric cyclopropanation and an X-ray crystallographic study of (1R,2R)-1,2-bis-[(1S,2S)-2-methylcyclopropyl]-1,2-ethanediyl 3,5-dinitrobenzoate
An improved two-step synthetic route to allylic alcohols from aldehydes has been developed. A modification of the HWE reaction in H2O–2-PrOH (1 ∶ 1) and a convenient protocol to prepare AlH3 in THF from LiAlH4 and n-BuBr are the key factors in the improvement.
Stereoselective synthesis of optically active mono and diaminoalcohols
作者:M. Teresa Barros、M. Adilia Januário Charmier、Christopher D. Maycock、Thierry Michaud
DOI:10.1016/j.tet.2005.06.011
日期:2005.8
Several opticallyactive mono and diaminopolyols have been synthesized starting from the octadienedioate 1, by regio- and stereo selective azidation of the corresponding alcohol by Mitsunobu/SN2 substitution.
几个光学活性单和diaminopolyols已经合成从octadienedioate开始1,由相应的醇的区域选择性和立体选择性的叠氮化通过光延/ S Ñ 2取代。
Stereochemical Elucidation of the Pentacyclopropane Antifungal Agent FR-900848
作者:Anthony G. M. Barrett、Wendel W. Doubleday、Krista Kasdorf、Gary J. Tustin
DOI:10.1021/jo960054k
日期:1996.1.1
Full structural elucidation of FR-900848, an antifungal pentacyclopropane nucleoside natural product from Streptoverticillium fervens, is reported. A series of model compounds were prepared using multiple asymmetric Simmons-Smith cyclopropanation reactions. Comparisons of spectroscopic data of synthetic alkenes 9 and 10, quatercyclopropanes 11 and 12, and imidazolidines 13 and 14 with FR-900848 and its degradation products 2, 3, and 4 were consistent with the full structural assignment of the natural product as structure 7.