Studies on the syntheses of heterocyclic and natural compounds. 950. Asymmetric total synthesis of (+)-chenodeoxycholic acid. Stereoselectivity of intramolecular cycloaddition of olefinic o-quinodimethanes
Studies Toward the Enantiospecific Total Synthesis of Rhodexin A
作者:Michael E. Jung、Mikhail Guzaev
DOI:10.1021/jo400909t
日期:2013.8.2
enantiospecific total synthesis of rhodexin A via a very hindered inverseelectrondemandDiels–Alderreaction are described. The C8-diastereomer of the fully elaborated tetracyclic core of rhodexin A, 23, was prepared in good yield and excellent selectivity using as the key step the stepwise Diels–Alderreaction of the very hindered dienone 3 and the silyl enolether 4 catalyzed by the very strong Lewis
Regiodivergent Remote Arylation of Cycloalkanols to Dysideanone′s Fused Carbotetracycles and Its Bridged Isomers
作者:Md Ashraful Haque、Chandan K. Jana
DOI:10.1002/chem.201703094
日期:2017.9.27
arylations across an all‐carbonquaternarycenter of cycloalkanols to access enantioenriched fused and bridged carbotetracycles are reported. The conformation of the carbocation guided either sequential stereospecific β‐C‐Me/γ‐C−H‐shifts or β‐C‐Me/γ′‐C−H‐shifts, providing fused carbotetracyclic analogs of dysideanone or bridged tetracycles, respectively. The reaction is highly stereoselective in building three
作者:Bruce H Lipshutz、Paul Mollard、Craig Lindsley、Virginia Chang
DOI:10.1016/s0040-4039(97)00239-6
日期:1997.3
Conversion of aldehydes and ketones to 1,3-dioxanes with 2-trimethylsilyl-1,3-propanediol affords carbonyl-protected products, ultimately susceptible to unmasking with LiBF4 in THF. (C) 1997 Elsevier Science Ltd.
Park Kwangyong, Scott William J., Wiemer David F., J. Org. Chem, 59 (1994) N 21, S 6313-6317
作者:Park Kwangyong, Scott William J., Wiemer David F.