Stereoselective approach to trisubstituted tetrahydropyrans
作者:Peter Mohr
DOI:10.1016/0040-4039(95)00312-z
日期:1995.4
allylsilanes of general structure 1 undergo with acetals 6 under mild Broensted acid catalysis a transacetalization-ring closure reaction to afford in moderate to good yield and high diastereoselectivity tetrahydropyrans 8 having all three substituent in an equatorial position.
Intramolecular reactions of 2-propynylsilanes with n-acyliminium ions
作者:Wim J. Klaver、Marinus J. Moolenaar、Henk Hiemstra、W.Nico Speckamp
DOI:10.1016/s0040-4020(01)86638-2
日期:1988.1
precursors lead to bridged azabicyclic systems 34–45 (Table I), containing the uncommon α-allenic amide functionality. After introduction of a tert-butoxycarbonyl or a tosyl group onto the lactam nitrogen atom, these molecules react with cuprates in an SN2' fashion. The products 52–58 (Table II) are angularly functionalized trans-fused carbobicycles containing a 1,3-diene moiety.
2-丙炔基硅烷与环状N-酰基亚胺离子前体的分子内酸辅助反应会导致桥连的氮杂双环体系34 – 45(表I),其中含有罕见的α-烯丙基酰胺官能团。在内酰胺氮原子上引入叔丁氧基羰基或甲苯磺酰基后,这些分子以S N 2'的方式与铜酸盐反应。产物52 – 58(表II)是含有1,3-二烯部分的有角度官能化的反式融合碳环。
Propargylsilane function as a terminator of biomimetic polyene cyclizations leading to steroids
作者:Rudolf Schmid、Peter L. Huesmann、William S. Johnson
DOI:10.1021/ja00535a063
日期:1980.7
Enantioselective route to 3-vinylidene tetrahydropyrans and 3-vinylidene oxepanes based on a silyl-Prins cyclization
A general method has been developed for the asymmetric synthesis of 3-vinylidene tetrahydropyrans and 3-vinylidene oxepanes based on the Lewis acid-catalyzed intramolecular reactions of oxocarbenium ions with propargylsilanes. The observed excellent diastereoselectivity and a high asymmetric induction offer a new synthetic method with a wide scope and generality. (c) 2008 Elsevier Ltd. All rights reserved.
KLAVER, WIM J.;MOOLENAAR, MARINUS J.;HIEMSTRA, HENK;SPECKAMP, W. NICO, TETRAHEDRON, 44,(1988) N 13, 3805-3818
作者:KLAVER, WIM J.、MOOLENAAR, MARINUS J.、HIEMSTRA, HENK、SPECKAMP, W. NICO