The intramolecular Csp3–H and/or C–C bond amination is very important in modern organic synthesis due to its efficiency in the construction of diversified N-heterocycles. Herein, we report a novel intramolecular cyclization of alkyl azides for the synthesis of cyclic imines and tertiary amines through selective Csp3–H and/or C–C bond cleavage. Two C–N single bonds or a CN double bond are efficiently
A melanin-concentrating hormone antagonist comprising a compound of the formula (I):
1
wherein Ar
1
is a cyclic group which may be substituted;
X and Y are the same or different and are a spacer having a main chain of 1 to 6 atoms; Ar is a condensed polycyclic aromatic ring which may be substituted; R
1
and R
2
are the same or different and are hydrogen atom or a hydrocarbon group which may be substituted; or R
1
and R
2
, together with the adjacent nitrogen atom, may form a nitrogen-containing heterocyclic ring which may be substituted; or R
2
, together with the adjacent nitrogen atom and Y, may form a nitrogen-containing heterocyclic ring which may be substituted; or R
2
, together with the adjacent nitrogen atom, Y and Ar, may form a condensed ring; or a salt thereof is useful as an agent for preventing or treating obesity, etc.