6-Epi-trehazolin was synthesized in a stereocontrolled manner, and this synthesis provided proof for the non-existence of oxazine structural isomer of 6-epi-trehazolin.
A novel route to a chiral building block for the preparation of cyclopentenyl carbocyclic nucleosides. Synthesis and anticancer activity of enantiomeric neplanocins A
The synthesis of both enantiomers of 3-[(tert-butyldimethylsilyl)oxy]methyl-4,5-O-isopropylidenecyclopent-2-en-1-ol was accomplished in six steps based on optically inactive dimethyl meso-tartrate. This key intermediate in the synthesis of cyclopentenyl carbocyclic nucleosides was subsequently applied in the preparation of enantiomeric neplanocins A. The toxic effect of these compounds was investigated
6-epi-Trehazolin was synthesized in a stereocontrolled manner, and this synthesis proved that an oxazine structural isomer of 6-epi-trehazolin does not exist.
Preparative and Stereoselective Synthesis of the Versatile Intermediate for Carbocyclic Nucleosides: Effects of the Bulky Protecting Groups to Enforce Facial Selectivity
作者:Won Jun Choi、Hyung Ryong Moon、Hea Ok Kim、Byul Nae Yoo、Jeong A Lee、Dae Hong Shin、Lak Shin Jeong
DOI:10.1021/jo0356762
日期:2004.4.1
The preparative and stereoselective synthesis (45-50% overall yields) of the target compound 17 has been accomplished from D-ribose. The bulky protecting groups such as TBDPS and Trityl enforced the facial selectivity during Grignard reaction to give the tertiary beta-allylic alcohol 16 as the sole product, which was oxidatively rearranged to the key molecule 17 in excellent yield.
STEREOSELECTIVE SYNTHESIS OF 3-HYDROXYMETHYL-D-CYCLOPENTENONE, THE VERSATILE INTERMEDIATE FOR THE SYNTHESIS OF CARBOCYCLIC NUCLEOSIDES
作者:Won Jun Choi、Hyung Ryong Moon、Hea Ok Kim、Young Mi Ko、Hye Jin Kim、Jeong A. Lee、Kang Man Lee、Mi Kyung Yun、Dae Hong Shin、Moon Woo Chun、Yhun Y. Sheen、Kilhyoun Kim、Lak Shin Jeong
DOI:10.1081/ncn-200061832
日期:2005.4.1
The preparative and stereoselective synthesis (45 - 50% overall yields, >50 g scale) of the key carbasugars 7a-d was achieved from D-ribose via stereoselective Grignard reaction and oxidative rearrangement as key reactions.