Enantiomerically pure 7-oxabicylo[2.2.1]hept-5-en-zyl derivatives as synthetic intermediates. Part III. Total synthesis ofD- andL-ribose derivatives
作者:J�rgen Wagner、Eric Vieira、Pierre Vogel
DOI:10.1002/hlca.19880710316
日期:1988.5.4
steps and 28% overall yield. Hydrolysis of D-5b and L-5b afforded methyl 2,3-O isopropylidene-β-D-ribofuranoside (D-5a) and methyl 2,3-O-isopropylidene β-L-ribofuranoside (L-5a), respectively. The intermediate (+)-(1R,4R,5R,6R) 5-exo,6-exo-(isopropylidenedioxy)-7-oxabicyclo[2.2.1]heptan-2-one ((+)-7) and its enantiomer(–)-7 were also obtained enantiomerically pure by resolution of (=)-7 by the Johnson-Zeller
对映异构纯的5-溴-5-脱氧-2,3- ø -异亚丙基β-D-(D- 5B)和-β-1-呋喃核糖苷(1- 5B( - ) - (1)已经被衍生自[R,2小号,4 - [R)-2-外型-氰基-7-氧杂双环[2.2.1]庚-5-烯内,基(1'小号)-camphanate(1)和(+) - (1-小号,2 - [R,4小号)-2-外型-氰基-7-氧杂双环[2.2.1]庚-5-烯-2-内型-基(1' - [R)-camphanate(2),分别在5合成步骤和28%的整体收率。D-5 b的水解和L- 5b中,得到甲基2,3-O-亚异丙基β-d呋喃核糖苷(d-5一个)和甲基2,3- ö异亚丙基β-L-呋喃核糖苷(L- 5A),分别。中间体(+)-(1 R,4 R,5 R,6 R)5- exo,6- exo-(异丙基二烯二氧基)-7-氧杂双环[2.2.1]庚二-2-酮((+)- 7)及其对映体( - )