Herein the synthesis of a novel and bench stable electrophilic reagent to construct the OCFHMe motif from O-nucleophiles has been described. This sulfonium salt, readily obtained in 5 steps, reacted with various phenols and alcohols. The resulting products, including complex molecules, were obtained in good yields. This reagent was also used for the functionalization of thiol derivatives.
There is described a process for the preparation of compounds of formula I
in which
R is hydrogen, optionally substituted alkyl, optionally substituted alkenyl optionally substituted cycloalkyl, optionally substituted phenyl or optionally substituted heterocyclyl, and
R1 and R2 are hydrogen, an organic radical or together with the ring to which they are attached, form an optionally substituted ring, which may contain one or more hetero atoms,
which comprises reacting a compound of formula II
with a compound of formula III
in which the ring Q is an optionally substituted heteroaromatic ring, which optionally comprises one or more further hetero atoms and to which is optionally fused an optionally substituted ring.
Lithium-chlorine exchange of α-chloro α-sulfonyl ketones, easily prepared from 1-chloroalkyl aryl sulfoxides and aldehydes in good yields, with n-butyllithium gave α-sulfonyl ketones in high yields. Some trials to trap the enolate intermediate were carried out.
Treatment of alpha-halo beta-mesyloxy sulfoxides, easily synthesized from aldehydes and 1-haloalkyl aryl sulfoxides in two steps, with n-BuLi at -78-degrees-C gives haloalkenes in good yields.
Matthews Donald P., Waid Philip P., Sabol Jeffrey S., McCarthy James R., Tetrahedron Lett, 35 (1994) N 29, S 5177-5180
作者:Matthews Donald P., Waid Philip P., Sabol Jeffrey S., McCarthy James R.