Dihyro- and tetrahydrofuran building blocks from 1,4:3,6-dianhydromannitol. 1. Synthesis of (1S,5R,7R)-endo-(-)- and (1S,5R,7S)-(-)-exo-brevicomin and (R)-(+)-dodecanolide
摘要:
The eliminative ring fission of iodides derived from 1,4:3,6-dianhydromannitol3 has been exploited for preparing three enantiomerically pure species, 1-3, which feature a di-or tetrahydrofuran moiety and one or two stereogenic centers. These species are extremely versatile building blocks for the construction of natural products. Their potential was demonstrated by the synthesis of the title insect pheromones.
Dihyro- and tetrahydrofuran building blocks from 1,4:3,6-dianhydromannitol. 1. Synthesis of (1S,5R,7R)-endo-(-)- and (1S,5R,7S)-(-)-exo-brevicomin and (R)-(+)-dodecanolide
摘要:
The eliminative ring fission of iodides derived from 1,4:3,6-dianhydromannitol3 has been exploited for preparing three enantiomerically pure species, 1-3, which feature a di-or tetrahydrofuran moiety and one or two stereogenic centers. These species are extremely versatile building blocks for the construction of natural products. Their potential was demonstrated by the synthesis of the title insect pheromones.
The present invention relates to compounds of formula (I)
wherein X, R
1
, R
2
, R
3
, R
4
and R
5
are as defined herein, which are useful for treating diseases which respond to CXCR2 receptor mediators. Pharmaceutical compositions that contain the compounds and processes for preparing the compounds are also described.
Chelation-controlled reduction of α- and β-oxygenated ketones with lithium tri-n-butylborohydride
作者:Anne-Marie Faucher、Christian Brochu、Serge R. Landry、Isabelle Duchesne、Susanne Hantos、Amélie Roy、Andrew Myles、Claude Legault
DOI:10.1016/s0040-4039(98)01883-8
日期:1998.11
Lithium tri-n-butyl borohydride showed high selectivity in the reduction of α- and β-oxygenated ketones, giving a preponderance of the chelation controlled products.
The present invention relates to compounds of formula (I)
wherein X, R
1
, R
2
, R
3
, R
4
and R
5
are as defined herein, which are useful for treating diseases which respond to CXCR2 receptor mediators. Pharmaceutical compositions that contain the compounds and processes for preparing the compounds are also described.
The present invention relates to compounds of formula (I)
wherein X, R
1
, R
2
, R
3
, R
4
and R
5
are as defined herein, which are useful for treating diseases which respond to CXCR2 receptor mediators. Pharmaceutical compositions that contain the compounds and processes for preparing the compounds are also described.
Chain-carbonyl transposition, an alternative strategy for the synthesis of the 6,8-dioxabicyclo[3.2.1]octanes: a synthesis of the (.+-.)-brevicomins and their oxidative cleavage to tetrahydrofurans
作者:R. Marshall Wilson、Jaidev S. Goudar、John E. Sidenstick