期刊
SYNTHESIS-STUTTGART
卷 49, 期 2, 页码 269-274出版社
GEORG THIEME VERLAG KG
DOI: 10.1055/s-0036-1588367
关键词
Prins reaction; catalysis; 1,3-dioxanes; molecular iodine; bis(trifluoromethanesulfonyl)imide salts
资金
- Fonds der Chemischen Industrie
The Prins reaction is an efficient method for the direct generation of 1,3-dioxanes from alkenes and aldehydes. As first published in 2008, this process can be effected by stoichiometric amounts of molecular iodine. We herein report a catalytic protocol allowing the use of iodine at low loading (0.5-5 mol%), smoothly effecting the condensation of styrenes with aliphatic aldehydes to rac-1,3-dioxanes. Moreover, this mild catalytic system effects the isomerization of the 1,3-dioxane products to the thermodynamically favored one. As a result, substituted rac-1,3-dioxanes were prepared in high yields (up to 92%), and with high diastereoselectivities (d.r. up to 82: 18). For the application of iodine in catalytic amounts, the addition of pyridinium bis(trifluoromethanesulfonyl)imide (TFSI) salts in a 1: 1 ratio to iodine is the key to success.
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