Preliminary Study of the Total Synthesis of Bao Gong Teng A Analogs Using 8-Benzyl-2-oxo-8-azabicyclo[3.2.1]oct-3-ene-6-endo/exo- and 7-endo/exo-carbonitrile
Total synthesis of Bao Gong Teng A, a natural antiglaucoma compound
摘要:
The total synthesis of Bao Gong Tong A (1), a novel natural product which shows antiglaucoma properties is described. The key step involves the highly regioselective and somewhat stereoselective 1,3-dipolar cycloaddition of acrylonitrile to N-benzyl-3-hydroxypyridinium bromide 2 to give the easily separable crystalline exo and endo diastereomers 3x and 3n in yields of 54% and 36%, respectively. Catalytic hydrogenation of the enone of 3x followed by reduction with sodium borohydride gave, via the saturated ketone 4, the exo alcohol 5x in 54% overall yield along with a small amount of the endo stereoisomer 5n. Protection of the alcohol followed by addition of methyl Grignard produced, after hydrolysis of the intermediate imine and the silyl other, the desired 6-exo-acetyl-8-benzyl-8-azabicyclo [3.2.1]octan-2-exo-ol (8) in 71 % yield. The synthesis of Bao Gong Teng A (1) was completed by first effecting a Baeyer-Villiger oxidation of 8 to give N-benzyl Bao Gong Teng A (9) (54% yield) and then cleaving the N-benzyl group by hydrogenolysis to produce 1 in 74% yield, thereby ending an eight-step synthesis of Bao Gong Teng A (1) in 8% overall yield from readily available starting materials.
Enantiodivergent Combination of Natural Product Scaffolds Enabled by Catalytic Enantioselective Cycloaddition
作者:Hao Xu、Christopher Golz、Carsten Strohmann、Andrey P. Antonchick、Herbert Waldmann
DOI:10.1002/anie.201602084
日期:2016.6.27
been established for the enantiodivergent synthesis of naturalproduct inspired compounds embodying both tropane and pyrrolidine naturalproduct fragments. This strategy includes the enantioselective kinetic resolution of racemic tropanes by means of a copper(I)‐catalyzed [3+2] cycloaddition and allows the preparation of two enantiopure products in a one‐pot reaction in high yield and with high diastereo‐