1990
DOI: 10.1021/ja00167a041
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Preparation of eight-membered cyclic ethers by Lewis acid promoted acetal-alkene cyclizations

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Cited by 96 publications
(20 citation statements)
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“…For instance, treatment of acetal 124 with SnCl 4 unveiled eight-membered cyclic ether 125, which still contains a vinylsilane function. [73] This product may arise via an ene pathway in which the two R groups are arranged according to the conformational preferences of the (Z)-cyclooctene-type scaffold [Eq. (17)].…”
Section: Wwwchemeurjorgmentioning
confidence: 99%
“…For instance, treatment of acetal 124 with SnCl 4 unveiled eight-membered cyclic ether 125, which still contains a vinylsilane function. [73] This product may arise via an ene pathway in which the two R groups are arranged according to the conformational preferences of the (Z)-cyclooctene-type scaffold [Eq. (17)].…”
Section: Wwwchemeurjorgmentioning
confidence: 99%
“…Although the ring closure to form this strained system was expected to be challenging, the Prins reaction has been previously used for the preparation of bridging polycycles. 14 Tricycle 15 could be assembled through a bioinspired ortho -quinone methide hetero-Diels–Alder ( o -QMHDA) reaction between enol ether 17 and an o -QM generated from 16 . 15 Although o -QMHDA reactions are widely used to construct chroman frameworks, simple acyclic enol ethers or styrenes are typically employed as dienophiles, and are used in excess to avoid o -QM dimerization.…”
Section: Design Plan: First Generation Strategymentioning
confidence: 99%
“…Thus, the acetoxyalkoxyacetic ester 281 cyclized under tin tetrachloride catalysis forming the corresponding tetrahydrooxepine 282 in moderate yield (Scheme 75) [106]. The same authors reported the cyclization of 5-alkenyl or 6-alkenyl acetals using tin tetrachloride as Lewis acid, forming the eight- [127] or nine-membered ring ethers, respectively [128]. The same authors reported the cyclization of 5-alkenyl or 6-alkenyl acetals using tin tetrachloride as Lewis acid, forming the eight- [127] or nine-membered ring ethers, respectively [128].…”
Section: Seven Eight and Nine Membered Rings Formationmentioning
confidence: 99%