Catalyst Controlled Site- and Stereoselective Rhodium(II) Carbene C(sp3)-H Functionalization of Allyl Boronates

Rhodium(II) catalyst-controlled site-and stereo-selective carbene insertion into the distal allylic C(sp3)-H bond of allyl boronates is reported. The optimum chiral catalyst for this reaction is Rh2(S-TPPTTL)4. The fidelity and asymmetric induction of this catalytic transformation allows for a highly diastereoselective and enantioselective C-C bond formation without interference from the allyl boronate functionality. The resulting functionalized allyl boronates are susceptible to stereo-selective allylations, generating products with control of stereo-chemistry at four contiguous stereogenic centers.

Automated summary

Rhodium(II) catalyst-controlled site- and stereo-selective carbene insertion into the allylic C(sp3)-H bond of allyl boronates is achieved. The chiral catalyst Rh2(S-TPPTTL)4 exhibits high fidelity and asymmetric induction, enabling diastereoselective and enantioselective C-C bond formation without interference from the allyl boronate functionality. The resulting functionalized allyl boronates are amenable to stereo-selective allylations, leading to products with control of stereochemistry at four contiguous stereogenic centers.