New 2-acyl-1,3-dioxane derivatives from (1R)-(-)-myrtenal:: stereochemical effect on their relative ability as chiral auxiliaries

被引:14
|
作者
Becerra-Martinez, Elvia [1 ]
Velazquez-Poncea, Pedro [1 ]
Sanchez-Aguilar, Miguel A. [1 ]
Rodriguez-Hosteguin, Alfredo [1 ]
Joseph-Nathan, Pedro [2 ]
Taniariz, Joaquin [1 ]
Zepeda, L. Gerardo [1 ]
机构
[1] Inst Politecn Nacl, Escuela Nacl Ciencias Biol, Dept Quim Organ, Mexico City 11340, DF, Mexico
[2] Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Quim, Mexico City 07000, DF, Mexico
关键词
D O I
10.1016/j.tetasy.2007.10.047
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Four 3,10-pinanediol derivatives 1a-d, prepared in 50-72% global yields from (IR)-(-)-myrtenal 2, were treated with (RO)(2)CHCOR3 (R-3 = CH3, Ph) to afford 2-acyl-1,3-dioxanes 3a-f. The latter were submitted to nucleophilic additions using several Grignard reagents to mainly afford carbinols generated by re diastereofacial attack (85-99% yield, >= 88:12 dr). The lowest diastereoselectivity was observed when PhLi or hydrides were used as nucleophiles. Only an equatorial substituent at C-3 modifies the diastereoselectivity of the nucleophilic additions. (c) 2007 Elsevier Ltd. All rights reserved.
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页码:2727 / 2737
页数:11
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