Benzotriazole complexes with amines and phenol: cooperativity mediated by induction effects in the crystal state

N2-Selective β-Thioalkylation of Benzotriazoles with Alkenes

Herein, N²-selective β-thioalkylation of benzotriazoles with unactivated alkenes and styrenes is reported. The N²-selective β-thioalkylation of benzotriazoles is highly stereospecific and works under simple and mild conditions, exhibiting excellent functional group tolerance. The high N²-selectivity is a consequence of the combination of hydrogen bonding and Lewis acid/base activation, which reverses the N²-position to be favored for alkylation.

Diamine-mediated N2-selective β-selenoalkylation of triazoles with alkenes

A N2-selective β-selenoalkylation of 1,2,3-triazoles with alkenes mediated by diamines has been developed. The reaction proceeds presumably via the interaction of diamines with both the triazole moiety and selenium/alkene complex to construct a U-shaped reaction intermediate. This activation mode will block the N1 position on triazoles and thus favor the N2-selective selenoamination. This stereospecific anti-addition method enables an efficient N2-selective β-selenoalkylation of 1,2,3-triazoles under mild and open-air conditions and might find applications in the synthesis of biologically active molecules.

X-ray and hydrogen-bonding properties of 1-((1H-benzotriazol-1-yl)methyl)naphthalen-2-ol

The solid state structure of 1-((1H-benzotriazol-1-yl)methyl)naphthalen-2-ol, C₁₇H₁₃N₃O, shows that this Mannich base crystallizes forming intermolecular N⋯HO hydrogen bonds, rather than intramolecular ones. Factors contributing to this choice of hydrogen-bonding mode are discussed. The compound crystallizes in the monoclinic system, P2₁/c space group, with lattice constants: a = 11.7934(9) Å, b = 14.3002(14) Å, c = 8.4444(8) Å, β = 106.243(5) deg, V = 1367.3(2) ų, Z = 4, F(000) = 576, R₁ = 6.96%, wR₂ = 11.4%.