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. 2020 May 22;13(10):2393. doi: 10.3390/ma13102393

Table 2.

Synthesis of aminophosphonates and phosphine oxides.

graphic file with name materials-13-02393-i001.jpg

No R1 R2 Yield, % dr (R:S)
2a OMe OMe 72 56:44
2b OPh OPh 69 50:50
2c OBn OBn 69 50:50
2d OEt Ph 54 50:50
2e Ph Ph 64 55:45
2f P-(R,R)-TADDOL 72 60:40
2g A P-(R,R)-TADDOL 36 97:3

A single epimer obtained by the crystallization of 2f.