Two novel, non-thiolic, odorless dithiol equivalents, α,α-diacetyl cyclic ketene dithioacetals 2a and 2b, had been developed. A range of carbonyl compounds 3 were converted into corresponding dithioacetals, dithianes 4 and dithiolanes 5, in high yields (up to 99%) in the presence of 2a or 2b. Moreover, 2a and 2b show high chemoselectivity between aldehyde and ketone in thioacetalization.
equivalent, 1 was investigated in the thioacetalization reaction. Various types of aldehydes and ketones 3 were converted to the corresponding dithianes 4 in the presence of 1 in high yields (79-97%). Moreover, 1 exhibited obvious chemoselectivity betweenaldehyde and ketone in this thioacetalization reaction. A mechanism for this thioacetalization reaction is proposed.
In Situ Generation of PhI<sup>+</sup>
CF<sub>3</sub>
and Transition-Metal-Free Oxidative sp<sup>2</sup>
CH Trifluoromethylation
作者:Cong Xu、Jingxin Liu、Wenbo Ming、Yingjie Liu、Jun Liu、Mang Wang、Qun Liu
DOI:10.1002/chem.201301585
日期:2013.7.8
to tri us: The introduction of CF3 units into organic molecules is important and requires the development of convenient trifluoromethylating reagents. Here, PhI+CF3, an acyclic electrophilic “CF3+” species, is described, including its in situ generation from TMSCF3, PhI(OAc)2, and KF and its direct applications in sp2 CH trifluoromethylations under mild transition‐metal‐free conditions (see scheme)
A Clean, Facile and Practical Synthesis of α-OxoketeneS,S-Acetals in Water
作者:Yan Ouyang、Dewen Dong、Haifeng Yu、Yongjiu Liang、Qun Liu
DOI:10.1002/adsc.200505331
日期:2006.1
A clean, facile and practical synthesis of α-oxoketene S,S-acetals in water has been developed. Catalyzed by tetrabutylammonium bromide (TBAB) at room temperature in water, a range of β-dicarbonyl compounds have been converted to the corresponding α-oxoketene S,S-acetals in very high yields. The catalyst in the aqueous phase can be recycled after the separation of organic products.
Reactions of ketene dithioacetals with bis-nucleophiles: Synthesis of novel heterocyclic thiols
作者:John M Mellor、Stephen R Schofield、Stewart R Korn
DOI:10.1016/s0040-4020(97)10137-5
日期:1997.12
The reactions of hydroxylamine, hydrazines, thiourea and guanidines with ketene dithioacetals are reported. The chemo- and regioselective aspects of the synthesis of the heterocyclic thiol products are contrasted with recently described processes based on related alkene substrates.