Optically active biaryl phosphorus compound and production process thereof

A phosphorus compound defined by the following general formula (1):

• in the formula (1), R1 denotes a hydrogen atom or a hydroxy protective group;
• R2 denotes a group defined by the following formula (R2-1) or (R2-2);
• R3, R4, R5, and R6 may be the same or different and independently denote a hydrogen atom, an alkyl group, an alkoxy group, an acyloxy group, a halogen atom, a haloalkyl group, or a dialkylamino group;
• two among R3, R4, R5, and R6 may form an aromatic ring optionally having a substituent group, and two among R3, R4, R5, and R6 may form a methylene chain optionally having a substituent group or a (poly)methylenedioxy group optionally having a substituent group:
• in the formula (R2-1) and (R2-2), R7 denotes an alkyl group, a cycloalkyl group, an aryl group, an alkoxy group, or an aryloxy group;
• R8 and R9 independently denote a hydrogen atom, an alkyl group, or an aryl group;
• z denotes a divalent group selected from an oxygen atom, a sulfur atom, NRN and Si(RSi)2, RN denoting an alkyl, an aryl, an alkanesulfonyl, an arylsulfonyl, or an acyl group and RSi denoting an alkyl or an aryl group or Si(RSi)2 may form a ring;
• and (a) denotes an integer of 0 or 1.