• SHYAMSUNDAR DAS

      Articles written in Journal of Chemical Sciences

    • Synthesis of four diastereomers of notoryne and their 13C NMR chemical shifts analysis

      SIBADATTA SENAPATI SHYAMSUNDAR DAS RUCHI DIXIT KUMAR VANKA CHEPURI V RAMANA

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      In this manuscript we document the details of the synthesis of four diastereomers of notoryne.The synthesis of one of the diastereomer having a similar relative stereochemistry of substituents on the bothTHF rings like notoryne, however, being the relative stereochemistry between the bridging carbon of thesetwo THF units is changed from anti to syn has been executed mainly to learn how the ring carbon chemicalshifts vary with this change. Interestingly, the deviations are found mainly for the carbons of THF ring thatbears the Br-group. In addition to this isomer, three more diastereomers having the relative stereochemistry ofsubstituents on either of the THF rings varied have been also synthesized. All four diastereomers have beensubjected for extensive NMR studies and their 13 C NMR chemical shifts have been compared with notoryneand laurendecumenyne B. In addition, chemical shifts for the four diastereomers along with these naturalproducts were calculated with the help of DFT calculations and compared to the experimentally obtainedchemical shift values.

      The notoryne diastereomer 1 having similar relative stereochemistry of substituents on both THF rings and being the relative stereochemistry between the bridging carbon of these two THF units is changed from anti to syn, has been executed to learn how the ring carbon chemical shifts vary with this change. Also, the three other diastereomers 2–4 have been synthesized and a detailed NMR analysis has been carried out/compared.

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